This is a discussion on HKS Downpipe Review! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hellooooooooo Verdugo...what's taking so long. I'm too excited to be patient. I ran in after work to read your review ...

hks downpipe

S-wrx: could you take a pic of the section where it bolts up to the catback. I ordered one from subarustore.com and i will be using the stock catback (resonator intact) however, with a dynomax bullet muffler welded on. I just want to see if it bottle necks or is 3" all the way through. thanks...

no problem, it is all the way the same diameter. Take a look at the pics, and HKS claims that it bolts right into the stock system (resonator im assuming), I have the stock resonator too, so it better fit in two weeks or else I have to do custom piping again.

As for the smell... welcome to being catless. Your exhaust will always smell like ass, people behind your car will be able to smell it. I could smell Austin's exhaust just cruising behind him. Or was that his exhaust?

Honestly Armin, I think you jumped the gun on that DP. The flat plate design has been cited as the cause for boost spiking in other cars here and WRXs in other parts of the world. You'll probably be able to get Smart Service to tune the inconsistency out, but it'll never perform as well as a bellmouth DP. Good thing it's cheap because I couldn't see spending a ton of cash on something that used the same crappy design as the stock pipe. Can you confirm whether or not it's stainless under the paint? I'm still betting on aluminized mild steel with hi temp paint.

downpipe

Verdugo~

How is the fit and finish of the piece. Does it fit with well with a stock or aftermarket catback? I will be bolting it up to the stocker. I don't want mine to smell either but that is price you must pay for running catless I guess. Shooting any flames?

Yeah, I might have jumped the gun, but it's cheap and I'm broke Should be fine for now...if I'm really dissatisfied with it, I'll go ahead and get a Godspeed downpipe down the road, so no worries for me.

Re: downpipe

Originally posted by imprezence Verdugo~

How is the fit and finish of the piece. Does it fit with well with a stock or aftermarket catback? I will be bolting it up to the stocker. I don't want mine to smell either but that is price you must pay for running catless I guess. Shooting any flames?

Evan

No flames as far as I know, but as you could tell from the video, there was some popping when I revved at idle. We'll see what happens after my unichip is properly tuned for it.

As far as I can tell, it fits just fine. That's why I'm curious about the sound though...I don't know if the sound is from a leak or if that's really just how a catless downpipe sounds.

Read posts from anyone who has put a TXS DP or pretty much any catless DP on. They allow a LOT more noise out. Remember, you don't have any more heat shields and fiberglass batting to dampen the exhaust sounds. Stainless pipe is notorious for being noise DP material. Mild steel is said to be a bit more quiet.

Thanks for the review Verdugo, I will install mine in approx. 2 weeks, and I can tell you whether or not I hear increase in air noise. From what a lot of people say, the if you run catless there will be an increase sound like the leak sound you described, but I could be wrong.

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